.banner{
    width: 90%;
    height: 400px;
    margin: 15px auto;
}
.banner img{
    display: block;
    width: 100%;
    height: 100%;
    object-fit:cover;
}
.zhuti{
    width: 90%;
    /* height: 400px; */
    margin: 0px auto;
    margin-bottom: 15px;
    /* background-color: beige; */

}
.yy{
    margin: 10px;
}